Registers
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RFC_OBS_CTRL0 (0x61AE) – RF Observation Mux Control 0
Bit
Name Reset R/W Description
No.
7 – 0 R0 Reserved. Read as 0
6
RFC_OBS_POL0
0 R/W The signal chosen by RFC_OBS_MUX0 is XORed with this bit
5:0
RFC_OBS_MUX0
00 0000 R/W Controls which observable signal from rf_core is to be muxed out to
rfc_obs_sigs(0); see Section 7.9.
00 0111: rfc_sniff_data – Data from packet sniffer, see Section 25.11
00 1000: rfc_sniff_clk – Clock for packet sniffer data, see Section 25.11
00 1001: tx_active
00 1010: rx_active
00 1011: vco_on – VCO on
Low: The VCO is powered down, so the next Rx or Tx operation must start
and calibrate the synthesizer before transmitting or receiving
High: The VCO is powered up. If the LLE is idle, it means the next task
starts quickly if frequency programming is disabled (PRF_CHAN.FREQ
= 127)
00 1100: sync_search – Rx search for sync
Low: The modem is not ready to receive a packet
High: The modem is in search for a sync word or receiving a packet
00 1101: lle_idle – Link-layer engine idle
Low: The LLE is busy processing or finishing a command, or in reset
High: The LLE is idle waiting for a command to start a new task
00 1110: wait_t2e1 – Indication on the LLE waiting for Timer 2 event 1 to
start a task
Low: Not waiting for Timer 2 event 1
High: Command processed, event 1 not yet received
00 1111: agc_lowgain – High if the AGC algorithm has reduced the
front-end gain; low otherwise
01 0011: fsc_lock – High when PLL is in lock; low otherwise
01 1011: pa_pd - Power amplifier power-down signal
10 1100: lnamix_pd - Low-noise amplifier power-down signal
11 0000: dem_sync_found - High when demodulator has detected a sync
word. Stays high until end of packet.
11 0001: mod_sync_sent - High when modulator has sent a sync word.
Stays high until end of packet.
Others: Reserved
RFC_OBS_CTRL1 (0x61AF) – RF Observation Mux Control 1
Bit
Name Reset R/W Description
No.
7 – 0 R0 Reseved. Read as 0
6
RFC_OBS_POL1
0 R/W The signal chosen by RFC_OBS_MUX1 is XORed with this bit.
5:0
RFC_OBS_MUX1
00 0000 R/W Controls which observable signal from rf_core is to be muxed out to
rfc_obs_sigs(1). See description of RFC_OBS_CTRL0.
RFC_OBS_CTRL2 (0x61B0) – RF Observation Mux Control 2
Bit
Name Reset R/W Description
No.
7 – 0 R0 Reseved. Read as 0
6
RFC_OBS_POL2
0 R/W The signal chosen by RFC_OBS_MUX2 is XORed with this bit.
5:0
RFC_OBS_MUX2
00 0000 R/W Controls which observable signal from rf_core is to be muxed out to
rfc_obs_sigs(2). See description of RFC_OBS_CTRL0.
346
CC2541 Proprietary Mode Radio SWRU191C– April 2009–Revised January 2012
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